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TITLE Conformal portal to dark matter
KIAS AUTHORS Ko, Pyungwon,Kaneta, Kunio
JOURNAL PHYSICAL REVIEW D, 2021
ARCHIVE 2106.01923
ABSTRACT We propose a new portal coupling to dark matter by taking advantage of the nonminimally coupled portal sector to the Ricci scalar. Such a portal sector conformally induces couplings to the trace of the energy-momentum tensor of matters including highly secluded dark matter particles. The portal coupling is so feeble that dark matter is produced by freeze-in processes of scatterings and/or the decay of the mediator. We consider two concrete realizations of the portal: conformally induced Higgs portal and conformally induced mediator portal. The former case is compatible with the Higgs inflation, while the latter case can be tested by dark matter direct detection experiments.
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